opportunity attack (D&D 5e)

My question has to do with situations where multiple "player characters" are in simultaneous combat with one or more "non-player characters". If an ally steps back after each hit on the enemy, but remains within its reach, causing the creature to follow, until it is eventually out of the ally’s reach, would the ally then receive an opportunity attack?? I have studied the players handbook, and other core books, Reddit, and google searched, to no avail.

No idea on how to use Attacks of Opportunity

I am a new DM. My friends are new too to the game as well, so we are trying to get familiar with the rules.

One rule that we can’t get is the one on attacks of opportunity.

My friends say that you get one every single time a monster attacks because “If he attacks, then gets to lower his guard” but I find that unfair because they will get 2 attacks every single time.

D&D 3.5e understanding attacks of opportunity

I am currently assisting in the dming of the game as far as understanding rules. in the last game session we played i experianced a AoO for the first time as did the actual dm. A pc(1) was engaged in combat with an enemy another pc(2) standing next to him moved away from that fight does that provoke an attack of opportunity from the enemy. also i understand an AoO to be a free attack so does that mean it doesnt have to roll hit? then one last question in the aforementioned situation if an enemy is engaged with pc(1) and pc(2) attacks enemy does the enemy shift target to pc(2) and does the pc(2) take any negatives for attacking the enemy via melee like a ranged attack would.

thank you for any feed back

Can a monk make a Stunning Strike on an Opportunity Attack?

The Monk Stunning Strike class feature states

When you hit with a melee weapon attack, you can spend 1 ki point to make the target stunned until the end of your next turn if it fails a CON saving throw.

Opportunity attacks allows you to

use your reaction to make one melee attack against the provoking creature.

Does an opportunity attack made with a melee weapon allow a monk to make their opportunity attack a stunning strike?

Can a battlemaster use Maneuvering Attack to prevent two creatures from opportunity attacking one ally?

Maneuvering Attack. When you hit a creature with a weapon attack, you can expend one superiority die to maneuver one of your comrades into a more advantageous position. You add the superiority die to the attack’s damage roll, and you choose a friendly creature who can see or hear you. That creature can use its reaction to move up to half its speed without provoking opportunity attacks from the target of your attack.

If an ally is within two enemies’ reaches, and the battlemaster has extra attack, hits and uses the maneuver on both enemies, and if the ally only uses the movement reaction when the second creature is hit, would that ally still take opportunity attacks from the first one?

Does an Echo provoke an opportunity attack when it moves?

The echo knight feature Manifest Echo says (emphasis mine):

At 3rd level, you can use a bonus action to magically manifest an echo of yourself in an unoccupied space you can see within 15 feet of you. This echo is a magical, translucent, gray image of you that lasts until it is destroyed, until you dismiss it as a bonus action, until you manifest another echo, or until you’re incapacitated.

Your echo has AC 14 + your proficiency bonus, 1 hit point, and immunity to all conditions. If it has to make a saving throw, it uses your saving throw bonus for the roll. It is the same size as you, and it occupies its space. On your turn, you can mentally command the echo to move up to 30 feet in any direction (no action required). If your echo is ever more than 30 feet from you at the end of your turn, it is destroyed.

Attack of Opportunity mentions (emphasis mine):

You can make an opportunity attack when a hostile creature that you can see moves out of your reach. To make the opportunity attack, you use your reaction to make one melee attack against the provoking creature. The attack occurs right before the creature leaves your reach.

The description does not state that the echo is a creature, so am I correct to conclude that the echo wouldn’t trigger an attack of opportunity?

Do Animated Objects make Opportunity Attacks?

Do the objects animated by the Animate Objects spell make opportunity attacks?

While I believe animated objects are certainly capable of opportunity attacks, the wording “If you command an object to attack, it can make a single melee attack against a creature within 5 feet of it” makes me wonder whether additional opportunity attacks are also implicit with this command.

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Can a druid get out of wild shape to avoid an opportunity attack?

Suppose a druid is shapeshifted into a beast of large size and adjacent (within 5 ft) of an enemy with a reach of 5ft.

On the druid’s turn, he reverts to humanoid form, reducing his size from large to medium and placing him out of the enemy’s reach. The druid can now move away without giving the enemy an opportunity attack.

Is this correct?